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26.05.2016 | Original Article | Ausgabe 7/2016

European Journal of Applied Physiology 7/2016

Thermoregulation in boys and men exercising at the same heat production per unit body mass

Zeitschrift:
European Journal of Applied Physiology > Ausgabe 7/2016
Autoren:
Gabriela T. Leites, Giovani S. Cunha, Joyce Obeid, Boguslaw Wilk, Flavia Meyer, Brian W. Timmons
Wichtige Hinweise
Communicated by Narihiko Kondo.

Abstract

Purpose

Child–adult thermoregulatory comparisons may be biased by differences in metabolic heat production (\(\dot{H}_{\text{p}}\)). We compared thermoregulatory responses of boys and men exercising at two intensities prescribed to elicit either a fixed \(\dot{H}_{\text{p}}\) per unit body mass (BM) or a fixed absolute \(\dot{H}_{\text{p}}\).

Methods

Ten boys (10–12 years) and 10 men (19–25 years) performed 4 × 20-min cycling at a fixed \(\dot{H}_{\text{p}}\) per BM (W kg−1) at 35 °C and 35 % relative humidity (MENREL). Men also cycled (MENABS) at the same absolute \(\dot{H}_{\text{p}}\) (in W) as the boys.

Results

\(\dot{H}_{\text{p}}\) was lower in boys compared with MENREL, but similar to MENABS (mean ± SD, 233.6 ± 38.4, 396.5 ± 72.3, 233.6 ± 34.1 W, respectively, P < 0.001). Conversely, \(\dot{H}_{\text{p}}\) per unit BM was similar between boys and MENREL, and lower in MENABS (5.7 ± 1.0, 5.6 ± 0.8 and 3.3 ± 0.3 W kg−1, respectively; P < 0.001). The change in rectal temperature was similar between boys and MENREL (0.6 ± 0.2 vs. 0.7 ± 0.2 °C, P = 0.92) but was lower in MENABS (0.3 ± 0.2 °C, P = 0.004). Sweat volume was lower in boys compared to MENABS (500 ± 173 vs. 710 ± 150 mL; P = 0.041), despite the same evaporative heat balance requirement (E req) (199.1 ± 34.2 vs. 201.0 ± 32.7 W, P = 0.87).

Conclusion

Boys and men demonstrated similar thermoregulatory responses to 80 min of exercise in the heat performed at a fixed \(\dot{H}_{\text{p}}\) per unit BM. Sweat volume was lower in boys compared to men, despite similarities in absolute \(\dot{H}_{\text{p}}\) and E req.

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